/in/foo.cc: In function 'int num_multi_one(int*, int, int*)':
/in/foo.cc:40:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int num_multi(int*, int*, int*)':
/in/foo.cc:56:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int numplus(int*, int*, int*)':
/in/foo.cc:72:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^